<!--
 * @Descripttion: 资源文件选择器
 * @version: 1.0
 * @Author: sakuya
 * @Date: 2021年10月11日16:01:40
 * @LastEditors:
 * @LastEditTime:
-->

<template>
	<div class="sc-file-select">
		<div class="sc-file-select__side" v-loading="menuLoading">
			<div class="sc-file-select__side-menu">
				<el-tree
					ref="group"
					class="menu"
					:data="menu"
					:node-key="treeProps.key"
					:props="treeProps"
					:current-node-key="menu.length > 0 ? menu[0][treeProps.key] : ''"
					highlight-current
					@node-click="groupClick"
				>
					<template #default="{ node }">
						<span class="el-tree-node__label">
							<el-icon class="icon"><el-icon-folder /></el-icon>{{ node.label }}
						</span>
					</template>
				</el-tree>
			</div>
			<div class="sc-file-select__side-msg" v-if="multiple">
				已选择 <b>{{ value.length }}</b> / <b>{{ max }}</b> 项
			</div>
		</div>
		<div class="sc-file-select__files" v-loading="listLoading">
			<div class="sc-file-select__top">
				<div class="upload" v-if="!hideUpload">
					<el-upload
						class="sc-file-select__upload"
						action=""
						multiple
						:show-file-list="false"
						:accept="accept"
						:on-change="uploadChange"
						:before-upload="uploadBefore"
						:on-progress="uploadProcess"
						:on-success="uploadSuccess"
						:on-error="uploadError"
						:http-request="uploadRequest"
					>
						<el-button type="primary" icon="el-icon-upload">本地上传</el-button>
					</el-upload>
					<span class="tips"
						><el-icon><el-icon-warning /></el-icon>大小不超过{{ maxSize }}MB</span
					>
				</div>
				<div class="keyword">
					<el-input
						v-model="keyword"
						prefix-icon="el-icon-search"
						placeholder="文件名搜索"
						clearable
						@keyup.enter="search"
						@clear="search"
					></el-input>
				</div>
			</div>
			<div class="sc-file-select__list">
				<el-scrollbar ref="scrollbar">
					<el-empty
						v-if="fileList.length == 0 && data.length == 0"
						description="无数据"
						:image-size="80"
					></el-empty>
					<div v-for="(file, index) in fileList" :key="index" class="sc-file-select__item">
						<div class="sc-file-select__item__file">
							<div class="sc-file-select__item__upload">
								<el-progress type="circle" :percentage="file.progress" :width="70"></el-progress>
							</div>
							<el-image :src="file.tempImg" fit="contain"></el-image>
						</div>
						<p>{{ file.name }}</p>
					</div>
					<div
						v-for="item in data"
						:key="item[fileProps.key]"
						class="sc-file-select__item"
						:class="{ active: value.includes(item[fileProps.url]) }"
						@click="select(item)"
					>
						<div class="sc-file-select__item__file">
							<div class="sc-file-select__item__checkbox" v-if="multiple">
								<el-icon><el-icon-check /></el-icon>
							</div>
							<div class="sc-file-select__item__select" v-else>
								<el-icon><el-icon-check /></el-icon>
							</div>
							<div class="sc-file-select__item__box"></div>
							<el-image
								v-if="_isImg(item[fileProps.url])"
								:src="item[fileProps.url]"
								fit="contain"
								lazy
							></el-image>
							<div v-else class="item-file item-file-doc">
								<i
									v-if="files[_getExt(item[fileProps.url])]"
									:class="files[_getExt(item[fileProps.url])].icon"
									:style="{
										color: files[_getExt(item[fileProps.url])].color
									}"
								></i>
								<i v-else class="sc-icon-file-list-fill" style="color: #999"></i>
							</div>
						</div>
						<p :title="item[fileProps.fileName]">
							{{ item[fileProps.fileName] }}
						</p>
					</div>
				</el-scrollbar>
			</div>
			<div class="sc-file-select__pagination">
				<el-pagination
					size="small"
					background
					layout="prev, pager, next"
					:total="total"
					:page-size="pageSize"
					v-model:currentPage="currentPage"
					@current-change="reload"
				></el-pagination>
			</div>
			<div class="sc-file-select__do">
				<slot name="do"></slot>
				<el-button type="primary" :disabled="value.length <= 0" @click="submit">确 定</el-button>
			</div>
		</div>
	</div>
</template>

<script>
	import config from '@/config/fileSelect'

	export default {
		props: {
			modelValue: null,
			hideUpload: { type: Boolean, default: false },
			multiple: { type: Boolean, default: false },
			max: { type: Number, default: config.max },
			onlyImage: { type: Boolean, default: false },
			maxSize: { type: Number, default: config.maxSize }
		},
		data() {
			return {
				keyword: null,
				pageSize: 20,
				total: 0,
				currentPage: 1,
				data: [],
				menu: [],
				menuId: '',
				value: this.multiple ? [] : '',
				fileList: [],
				accept: this.onlyImage ? 'image/gif, image/jpeg, image/png' : '',
				listLoading: false,
				menuLoading: false,
				treeProps: config.menuProps,
				fileProps: config.fileProps,
				files: config.files
			}
		},
		watch: {
			multiple() {
				this.value = this.multiple ? [] : ''
				this.$emit('update:modelValue', JSON.parse(JSON.stringify(this.value)))
			}
		},
		mounted() {
			this.getMenu()
			this.getData()
		},
		methods: {
			//获取分类数据
			async getMenu() {
				this.menuLoading = true
				var res = await config.menuApiObj.get()
				this.menu = res.data
				this.menuLoading = false
			},
			//获取列表数据
			async getData() {
				this.listLoading = true
				var reqData = {
					[config.request.menuKey]: this.menuId,
					[config.request.page]: this.currentPage,
					[config.request.pageSize]: this.pageSize,
					[config.request.keyword]: this.keyword
				}
				if (this.onlyImage) {
					reqData.type = 'image'
				}
				var res = await config.listApiObj.get(reqData)
				var parseData = config.listParseData(res)
				this.data = parseData.rows
				this.total = parseData.total
				this.listLoading = false
				this.$refs.scrollbar.setScrollTop(0)
			},
			//树点击事件
			groupClick(data) {
				this.menuId = data.id
				this.currentPage = 1
				this.keyword = null
				this.getData()
			},
			//分页刷新表格
			reload() {
				this.getData()
			},
			search() {
				this.currentPage = 1
				this.getData()
			},
			select(item) {
				const itemUrl = item[this.fileProps.url]
				if (this.multiple) {
					if (this.value.includes(itemUrl)) {
						this.value.splice(
							this.value.findIndex((f) => f == itemUrl),
							1
						)
					} else {
						this.value.push(itemUrl)
					}
				} else {
					if (this.value.includes(itemUrl)) {
						this.value = ''
					} else {
						this.value = itemUrl
					}
				}
			},
			submit() {
				const value = JSON.parse(JSON.stringify(this.value))
				this.$emit('update:modelValue', value)
				this.$emit('submit', value)
			},
			//上传处理
			uploadChange(file, fileList) {
				file.tempImg = URL.createObjectURL(file.raw)
				this.fileList = fileList
			},
			uploadBefore(file) {
				const maxSize = file.size / 1024 / 1024 < this.maxSize
				if (!maxSize) {
					this.$message.warning(`上传文件大小不能超过 ${this.maxSize}MB!`)
					return false
				}
			},
			uploadRequest(param) {
				var apiObj = config.apiObj
				const data = new FormData()
				data.append('file', param.file)
				data.append([config.request.menuKey], this.menuId)
				apiObj
					.post(data, {
						onUploadProgress: (e) => {
							param.onProgress(e)
						}
					})
					.then((res) => {
						param.onSuccess(res)
					})
					.catch((err) => {
						param.onError(err)
					})
			},
			uploadProcess(event, file) {
				file.progress = Number(((event.loaded / event.total) * 100).toFixed(2))
			},
			uploadSuccess(res, file) {
				this.fileList.splice(
					this.fileList.findIndex((f) => f.uid == file.uid),
					1
				)
				var response = config.uploadParseData(res)
				this.data.unshift({
					[this.fileProps.key]: response.id,
					[this.fileProps.fileName]: response.fileName,
					[this.fileProps.url]: response.url
				})
				if (!this.multiple) {
					this.value = response.url
				}
			},
			uploadError(err) {
				this.$notify.error({
					title: '上传文件错误',
					message: err
				})
			},
			//内置函数
			_isImg(fileUrl) {
				const imgExt = ['.jpg', '.jpeg', '.png', '.gif', '.bmp']
				const fileExt = fileUrl.substring(fileUrl.lastIndexOf('.'))
				return imgExt.indexOf(fileExt) != -1
			},
			_getExt(fileUrl) {
				return fileUrl.substring(fileUrl.lastIndexOf('.') + 1)
			}
		}
	}
</script>

<style scoped>
	.sc-file-select {
		display: flex;
	}
	.sc-file-select__files {
		flex: 1;
	}

	.sc-file-select__list {
		height: 400px;
	}
	.sc-file-select__item {
		display: inline-block;
		float: left;
		margin: 0 15px 25px 0;
		width: 110px;
		cursor: pointer;
	}
	.sc-file-select__item__file {
		width: 110px;
		height: 110px;
		position: relative;
	}
	.sc-file-select__item__file .el-image {
		width: 110px;
		height: 110px;
	}
	.sc-file-select__item__box {
		position: absolute;
		top: 0;
		right: 0;
		bottom: 0;
		left: 0;
		border: 2px solid var(--el-color-success);
		z-index: 1;
		display: none;
	}
	.sc-file-select__item__box::before {
		content: '';
		position: absolute;
		top: 0;
		right: 0;
		bottom: 0;
		left: 0;
		background: var(--el-color-success);
		opacity: 0.2;
		display: none;
	}
	.sc-file-select__item:hover .sc-file-select__item__box {
		display: block;
	}
	.sc-file-select__item.active .sc-file-select__item__box {
		display: block;
	}
	.sc-file-select__item.active .sc-file-select__item__box::before {
		display: block;
	}
	.sc-file-select__item p {
		margin-top: 10px;
		white-space: nowrap;
		text-overflow: ellipsis;
		overflow: hidden;
		-webkit-text-overflow: ellipsis;
		text-align: center;
	}
	.sc-file-select__item__checkbox {
		position: absolute;
		width: 20px;
		height: 20px;
		top: 7px;
		right: 7px;
		z-index: 2;
		background: rgba(0, 0, 0, 0.2);
		border: 1px solid #fff;
		display: flex;
		flex-direction: column;
		align-items: center;
		justify-content: center;
	}
	.sc-file-select__item__checkbox i {
		font-size: 14px;
		color: #fff;
		font-weight: bold;
		display: none;
	}
	.sc-file-select__item__select {
		position: absolute;
		width: 20px;
		height: 20px;
		top: 0px;
		right: 0px;
		z-index: 2;
		background: var(--el-color-success);
		display: none;
		flex-direction: column;
		align-items: center;
		justify-content: center;
	}
	.sc-file-select__item__select i {
		font-size: 14px;
		color: #fff;
		font-weight: bold;
	}
	.sc-file-select__item.active .sc-file-select__item__checkbox {
		background: var(--el-color-success);
	}
	.sc-file-select__item.active .sc-file-select__item__checkbox i {
		display: block;
	}
	.sc-file-select__item.active .sc-file-select__item__select {
		display: flex;
	}
	.sc-file-select__item__file .item-file {
		width: 110px;
		height: 110px;
		display: flex;
		flex-direction: column;
		align-items: center;
		justify-content: center;
	}
	.sc-file-select__item__file .item-file i {
		font-size: 40px;
	}
	.sc-file-select__item__file .item-file.item-file-doc {
		color: #409eff;
	}

	.sc-file-select__item__upload {
		position: absolute;
		top: 0;
		right: 0;
		bottom: 0;
		left: 0;
		z-index: 1;
		background: rgba(255, 255, 255, 0.7);
		display: flex;
		flex-direction: column;
		align-items: center;
		justify-content: center;
	}

	.sc-file-select__side {
		width: 200px;
		margin-right: 15px;
		border-right: 1px solid rgba(128, 128, 128, 0.2);
		display: flex;
		flex-flow: column;
	}
	.sc-file-select__side-menu {
		flex: 1;
	}
	.sc-file-select__side-msg {
		height: 32px;
		line-height: 32px;
	}

	.sc-file-select__top {
		margin-bottom: 15px;
		display: flex;
		justify-content: space-between;
	}
	.sc-file-select__upload {
		display: inline-block;
	}
	.sc-file-select__top .tips {
		font-size: 12px;
		margin-left: 10px;
		color: #999;
	}
	.sc-file-select__top .tips i {
		font-size: 14px;
		margin-right: 5px;
		position: relative;
		bottom: -0.125em;
	}
	.sc-file-select__pagination {
		margin: 15px 0;
	}

	.sc-file-select__do {
		text-align: right;
	}
</style>
